diff --git a/generators/app/templates/_karma.conf.js b/generators/app/templates/_karma.conf.js
index d6ea4cd2..1db56d6c 100644
--- a/generators/app/templates/_karma.conf.js
+++ b/generators/app/templates/_karma.conf.js
@@ -103,6 +103,9 @@ module.exports = function(config) {
       'karma-phantomjs-shim',
       'karma-coverage',
       'karma-jasmine',
+<% if (props.jsPreprocessor.key === 'typescript') { -%>
+      'karma-sourcemap-loader',
+<% } -%>
       'karma-ng-html2js-preprocessor'
     ],
 
diff --git a/generators/app/templates/_package.json b/generators/app/templates/_package.json
index 18195d63..7aec10d8 100644
--- a/generators/app/templates/_package.json
+++ b/generators/app/templates/_package.json
@@ -63,6 +63,7 @@
     "ts-loader": "~0.8.0",
     "tslint-loader": "~1.0.2",
     "typings": "~0.7.9",
+    "karma-sourcemap-loader": "~0.3.6",
 <% } else if (props.jsPreprocessor.srcExtension !== 'es6') { -%>
     "gulp-angular-filesort": "~1.1.1",
 <% } if (props.htmlPreprocessor.key !== 'noHtmlPrepro') { -%>
diff --git a/generators/app/templates/gulp/_unit-tests.js b/generators/app/templates/gulp/_unit-tests.js
index 61fe9b9e..c9a5a63a 100644
--- a/generators/app/templates/gulp/_unit-tests.js
+++ b/generators/app/templates/gulp/_unit-tests.js
@@ -33,6 +33,12 @@ function runTests (singleRun, done) {
     preprocessors[path] = ['ng-html2js'];
   });
 
+<% if (props.jsPreprocessor.key === 'typescript') { -%>
+  pathSrcJs.forEach(function(path) {
+    preprocessors[path] = ['sourcemap'];
+  });
+<% } -%>
+
   if (singleRun) {
     pathSrcJs.forEach(function(path) {
       preprocessors[path] = ['coverage'];